set enable QPushButton doesn't work.

[HelloDan]

FileFilter::FileFilter(QWidget *parent):QDialog(parent)
{
 
  setupUi(this);
	// Disable relative buttons
  loadButton->setEnabled(false);
  buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
 
  //connect signals and slots
  connect(browseButton,SIGNAL(clicked()),this,SLOT(browse()));
  connect(selectButton,SIGNAL(clicked()),this,SLOT(select()));
 // connect(loadButton,SIGNAL(clicked()),this,SLOT(load()));
 // connect(buttonBox->button(QDialogButtonBox::Ok),SIGNAL(clicked()),this,SLOT(deleteInDir()));
  connect(fileTypeComboBox,SIGNAL(currentIndexChanged(int index)), this, SLOT(textChanged()));
  connect(deletedDirComboBox,SIGNAL(currentIndexChanged(int index)), this, SLOT(textChanged()));
  connect(sourceDirComboBox,SIGNAL(currentIndexChanged(int index)), this, SLOT(textChanged()));
}
 
 
 
// if all the file input directory have been configured, enable OK and button.
void FileFilter::textChanged()
{
  buttonBox->button(QDialogButtonBox::Ok)->setEnabled((!(sourceDirComboBox->currentText()).isEmpty())&&(!(deletedDirComboBox->currentText()).isEmpty())&&(!(fileTypeComboBox->currentText()).isEmpty()));
  loadButton->setEnabled((!(sourceDirComboBox->currentText()).isEmpty())&&(!(deletedDirComboBox->currentText()).isEmpty())&&(!(fileTypeComboBox->currentText()).isEmpty()));
}
 
 
 
void FileFilter::browse()
{
     QString directory = QFileDialog::getExistingDirectory(this,
                                tr("Select a directory"), QDir::currentPath());
     if (!directory.isEmpty()) 
     {
         sourceDirComboBox->addItem(QDir::toNativeSeparators(directory));
         sourceDirComboBox->setCurrentIndex(sourceDirComboBox->count() - 1);
     }    
}
 
 
 
 
 
// select a dir to delete files from it
void FileFilter::select()
{
     QString directory = QFileDialog::getExistingDirectory(this,
                                tr("Select directory"), QDir::currentPath());
     if (!directory.isEmpty()) 
     {
         deletedDirComboBox->addItem(QDir::toNativeSeparators(directory));
         deletedDirComboBox->setCurrentIndex(deletedDirComboBox->count() - 1);        
     }	
}

FileFilter::FileFilter(QWidget *parent):QDialog(parent)
{

  setupUi(this);
	// Disable relative buttons
  loadButton->setEnabled(false);
  buttonBox->button(QDialogButtonBox::Ok)->setEnabled(false);
	
  //connect signals and slots
  connect(browseButton,SIGNAL(clicked()),this,SLOT(browse()));
  connect(selectButton,SIGNAL(clicked()),this,SLOT(select()));
 // connect(loadButton,SIGNAL(clicked()),this,SLOT(load()));
 // connect(buttonBox->button(QDialogButtonBox::Ok),SIGNAL(clicked()),this,SLOT(deleteInDir()));
  connect(fileTypeComboBox,SIGNAL(currentIndexChanged(int index)), this, SLOT(textChanged()));
  connect(deletedDirComboBox,SIGNAL(currentIndexChanged(int index)), this, SLOT(textChanged()));
  connect(sourceDirComboBox,SIGNAL(currentIndexChanged(int index)), this, SLOT(textChanged()));
}



// if all the file input directory have been configured, enable OK and button.
void FileFilter::textChanged()
{
  buttonBox->button(QDialogButtonBox::Ok)->setEnabled((!(sourceDirComboBox->currentText()).isEmpty())&&(!(deletedDirComboBox->currentText()).isEmpty())&&(!(fileTypeComboBox->currentText()).isEmpty()));
  loadButton->setEnabled((!(sourceDirComboBox->currentText()).isEmpty())&&(!(deletedDirComboBox->currentText()).isEmpty())&&(!(fileTypeComboBox->currentText()).isEmpty()));
}



void FileFilter::browse()
{
     QString directory = QFileDialog::getExistingDirectory(this,
                                tr("Select a directory"), QDir::currentPath());
     if (!directory.isEmpty()) 
     {
         sourceDirComboBox->addItem(QDir::toNativeSeparators(directory));
         sourceDirComboBox->setCurrentIndex(sourceDirComboBox->count() - 1);
     }    
}





// select a dir to delete files from it
void FileFilter::select()
{
     QString directory = QFileDialog::getExistingDirectory(this,
                                tr("Select directory"), QDir::currentPath());
     if (!directory.isEmpty()) 
     {
         deletedDirComboBox->addItem(QDir::toNativeSeparators(directory));
         deletedDirComboBox->setCurrentIndex(deletedDirComboBox->count() - 1);        
     }	
}

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Hi my friends! I'm coming for help again.

In a dialog base app, I use two QFileDialogs to get dirs to store in two comboxs. if the three comboxs are not empty, it will enable the OK and Load buttons, But my code doesen't work. Could you help to find the problem?

Thanks!

[HelloDan]

I also tried void QComboBox::editTextChanged ( const QString & text ) [signal] instead of currentIndexChanged(int index), but failed too.

[HelloDan]

I come to know that, the complier tell me.

No such signal QComboBox::currentIndexChanged(int index) in filefilter.cpp:22


But that does have a QComboBox::currentIndexChanged(int index) signal. Why?

By the way, the following segment code is just copy from the demo

for(int i = 0; i < files.size(); ++i)
     {
         QFile file(currentDir.absoluteFilePath(files[i]));
         qint64 size = QFileInfo(file).size();
 
         QTableWidgetItem *fileNameItem = new QTableWidgetItem(files[i]);
         fileNameItem->setFlags(fileNameItem->flags() ^ Qt::ItemIsEditable);
         QTableWidgetItem *sizeItem = new QTableWidgetItem(tr("%1 KB")
                                              .arg(int((size + 1023) / 1024)));
         sizeItem->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
         sizeItem->setFlags(sizeItem->flags() ^ Qt::ItemIsEditable);
 
         int row = filesTable->rowCount();
         filesTable->insertRow(row);
         filesTable->setItem(row, 0, fileNameItem);
         filesTable->setItem(row, 1, sizeItem);
     }

for(int i = 0; i < files.size(); ++i)
     {
         QFile file(currentDir.absoluteFilePath(files[i]));
         qint64 size = QFileInfo(file).size();

         QTableWidgetItem *fileNameItem = new QTableWidgetItem(files[i]);
         fileNameItem->setFlags(fileNameItem->flags() ^ Qt::ItemIsEditable);
         QTableWidgetItem *sizeItem = new QTableWidgetItem(tr("%1 KB")
                                              .arg(int((size + 1023) / 1024)));
         sizeItem->setTextAlignment(Qt::AlignRight | Qt::AlignVCenter);
         sizeItem->setFlags(sizeItem->flags() ^ Qt::ItemIsEditable);

         int row = filesTable->rowCount();
         filesTable->insertRow(row);
         filesTable->setItem(row, 0, fileNameItem);
         filesTable->setItem(row, 1, sizeItem);
     }

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But why the size show in cells are 0. The files are MP3, Their sizes are not zero.

[aamer4yu]

You are not supposed to give name of data type in connect..
ie.

connect(fileTypeComboBox,SIGNAL(currentIndexChange d(int index)), this, SLOT(textChanged()));

should be

connect(fileTypeComboBox,SIGNAL(currentIndexChange d(int)), this, SLOT(textChanged()));

[HelloDan]

You are not supposed to give name of data type in connect..
ie.
should be

What about the zero file size? I copy the code from the demo

[HelloDan]

the problem had been solved.
QDir currentDir = QDir(sourcePath); I make it a local variable.

Thanks for you attention!